Muffler.



J. F. HINTZ.

MUFFLER.

APPLICATION FILED 111111123, 1913.

11,103,769. Patented July 14,1914.

2 SHEETSSHEET 1.

J07? F Hing J. F. HINTZ.

MUFFLER.

APPLICATION FILED JULY23,1913.

1,103,769. Patented July 14,1914.

2 SHBETSSHEBT 2.

6 lwvmtoz @7171 F. fling Wit-meson a W 61mm JOHN F. HINTZ, OF BRILLION, WISCONSIN.

MUFFLER.

Specification of Letters Patent.

Patented July 14, 1914.

Application filed July23, 1913. Serial No. 780,747.

, To all whom it may concern Be it known that I, JOHN F. HINTZ, a citizen of the United States, residing at Brillion, in the county of Calumet and State of Wisconsin, have invented new and useful Improvements in Mufiiers, of which the following is a specification.

The present invention provides means for mufl'ling the exhaust of internal combustion engines, being particularly designed for marine or stationary engines, but which may be used to advantage for muffling the exhaust of automobile engines.

The invention provides a mufiler embodying a cylinder closed at its ends by means of heads, one of such heads being provided with a plurality of outlets, a drum located within the cylinder, 2. plate or head closing one end of the drum and adapted to close the outlet-s in the head of the cylinder provided with the plurality of openings. A spring for holding the drum with its head spaced from the head of the cylinder provided with the plurality of openings, and

'means for regulating the movement of such drum.

The invention consists of the novel features, details ofc'onstruction and combination of parts, which hereinafter will be more particularly set forth, illustrated in the accompanying drawings, and pointed out in the appended claims.

Referring to the drawings, forming a part ofthe specification, Figure 1 is a perspective view of a' muffler embodying the invention. Fig.2 is a longitudinal section of the cylinder and heads, showing the drum and remaining parts in elevation. Fig. 3 is an enlarged sectionalview of an end portion of the mufiier. Fig. 4 is a detail view of the head of the cylinder provided with the plurality of openings and a raised seat for the drum to close against.

Corresponding and like parts are referred to in the following description, and indicated in all the views of the drawings, by the same reference characters.

The numeral 1 ,designates the cylinder which is cl0Sed at its ends by means of heads 2 and 3. Bolts 4 pass through the cylinder and openings formed in the heads 2 and 3 and connect the several parts. The heads are retained in place by means of flanges which embrace the sides of the cylinder 1. The head 2 is provided with a plurality of openings 5 which constitute outlets for the exhaust gases. A rib of annular form incloses the openings 5 and-constitutes a seat for the drum to close upon when the exhaust gases are confined within the cylinder. A boss 7 projects outwardly from the head 2 and is externally threaded to receive a tube 8, which is threaded thereon. A cap 9 closes the outer end of the tube 8 and is centrally apertured to receive a rod 10 which is mounted in the boss 7 and has a limited longitudinal movement. The drum 11 is connected with the inner end of the rod 10 and moves therewith. A flat spring 12 is mounted upon the inner end of the rod 10 and comes between the drum 11 and the head 2 and normally exerts a pressure to hold the drum 11 spaced from the head 2 so that the exhaust gases may pass from the cylinder through the openings 5 in the head 2. Stops l3 and 14 are mounted upon the rod 10 and limit the movement thereof. The inner stop 13 is adapted to engage the boss 7 and thereby regulate the space between the head of the drum and the inner face of the head 2. The outer stop 14 is adapted to engage the cap 9 and limit the movement of the drum when closing. Each of the stops 13 and 14 consists of a nut which is mounted upon the rod 10. A jam nut cooperates with each of the nuts 13 and 14 to hold the same in the adjusted position. lVashers 15 are interposed between the stops 13 and 14 and the parts adjacent such stops to form buffers to prevent any clacking in the movement of the drum. a

The drum 11 consists of a cylinder which is open at one end and closed at its opposite end, the closed end being secured to a disk or plate 16, which is adapted to close'against the annular rib 6 of the head 2 and thereby confine the exhaust gases within the cylinder. The disk or plate 16 is bolted or otherwise secured to the closed end of the drum 11 and is provided with a raised portion 17 which is adapted to close against the annular rib 6. The annular rib or raised portions 6 and 17 form a space in which the spring 12 is located. An opening is formed in the lower portion of the head 2 for the circulation of water when the mufller is used in connection with a marine engine.

In the operation of the invention the pipe receiving the exhaust from the engine makes connection with the head 3, the latter being provided at a central point with an internally threaded boss to receive such pipe.

When the gases'exhaust from the engine and enter the cylinder a pressure is created upon the disk or plate 16,.thereby moving the drum to close the openings 5 in the head 2. The cylinder is of a size to receive the exhaust gases and a moment after the gases have entered the cylinder the drum 11 is moved by the action of the spring 12, thereby uncovering the openings 5 to admit of the burnt gases escaping therethrough preliminary to the cvlinder receiving the next charge of the exhaust from the engine. The escape is distributed and is so broken up by the openings 5 and by the tortuous passage of the gases around the drum andthe part 16 that but little or no noise results from the final discharge of the burnt gases into the air.

It is to be understood that the exhaust gases enter the cylinder 1 with a rush and great force and pass directly into the cylinder 11, thereby movin such cylinder against the tension of the spring 12 to close the head 16 against the head 2. After the inrush of the gases ceases the bulk of the gases practically confined in the cylinder 11 expand into the cylinder 1,thereby materially reducing the pressure to such an extent as to ad mit of the spring 12 regaining itself and moving the cylinder 11 to carry the head or plate 16 away from the plate 2. This provides an escape for the gases preliminary to the next discharge of the exhaust, which as well known is intermittent.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and of the method of'operation will be readily apparent to those skilled in the art to which the invention appertains, and while I have described the principle of operation of the invention, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired as are within the scope of the claims appended hereto,

Having thus described the invention what is claimed as new, is

1. In a mufiler of the character specified the combination of a cylinder having opposite ends closed and having one of such ends provided with a plurality of openings, a drum arranged within the cylinder and having one end open and the opposite end closed, the closed end being arranged adjacent the end of thecylinder provided with the plurality of discharge openings, said drumbeing moved upOn the entrance of the exhaust gases into the cylinder to close the openings of the cy'linderend, and a spring normally exerting'a pressure to move the drum to uncover the openings in the end of the cylinder to provide an escape for the burnt gases.

2. In a mufiler of the character specified the combination of a drum having opposite ends closed by means of heads, one of such heads having an inlet to receive the burnt gases and the other one of the heads being provided with a plurality of openings, a

I drum arranged within the cylinder and having one end closed and its opposite end open, the open end of the drum facing the inlet of the cylinder, and the closed end of the drum being adapted to close the outlets in the head of the cylinder, and a spring arranged to exert a pressure upon the drum to move the same away from the head of the cylinder provided with the discharge openings.

3. A muffler of the character specified comprising a cylinder, heads closing the ends of the cylinder, one of such heads having an inlet to receive the burnt gases and the other head being provided with a plurality of outlets, a drum arranged within the cylinder and having one end open and facing the inlet of the cylinder, a plate closing the opposite end of the drum and adapt- .of outlets, a rod slidably mounted in the head of the cylinder having the outlets, means for limiting the longitudinal movement of the rod, a drum secured to the inner end of the rod and having one end open and facing the inlet of the cylinder and having its opposite end closed and adapted to v abut against the head of the cylinder having the outlets to close the latter, and a spring normally exerting a pressure to hold. the head of the drum spaced from the head of the cylinder having the outlets formed therein. a

In testimon whereof I aflix my signature in presence 0 two witnesses.

JOHN F. HINTZQ Witnesses THOS. R. KING, G. P. KENNEDY. 

